Static uchar pkt_buff _aligned(PKTALIGN) static struct ip_udp_hdr *_net_defragment(struct ip_udp_hdr *ip, int *lenp) However, this it can be effectively leveraged to root linux based embedded devices locally. This bug is only exploitable from the local network as it requires crafting a malformed packet which would most likely be dropped during routing. Through a second fragment, this attacker-controlled metadata can be exploited to perform a controlled write to an arbitrary offset. The subsequent memcpy then overwrites the hole metadata with the fragment data. This ultimately results in a truncated division by 8 resulting in a value of 0, forcing the hole metadata and fragment to point to the same location. In compiled versions of U-Boot that define CONFIG_IP_DEFRAG, a value of ip->ip_len (IP packet header’s total Length) higher than IP_HDR_SIZE and strictly lower than IP_HDR_SIZE+8 leads to a value for len comprised between 0 and 7. The U-Boot implementation of RFC815 IP DATAGRAM REASSEMBLY ALGORITHMS is susceptible to a Hole Descriptor overwrite attack which ultimately leads to an arbitrary write primitive. In u-boot/net/net.c the _net_defragment function line 900 through 1018. U-boot is a popular boot loader for embedded systems with implementations for a large number of architectures and prominent in most linux based embedded systems. Technical Advisories: Hole Descriptor Overwrite in U-Boot IP Packet Defragmentation Leads to Arbitrary Out of Bounds Write Primitive (CVE-2022-30790)Ĭritical 9.6 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H) Proof of concept code will be made available once the fixes have been published. Technical Advisory – Large buffer overflow leads to DoS in U-Boot IP Packet Defragmentation Code ( CVE-2022-30552).Technical Advisory – Hole Descriptor Overwrite in U-Boot IP Packet Defragmentation Leads to Arbitrary Out of Bounds Write Primitive ( CVE-2022-30790).Two vulnerabilities were uncovered in the IP Defragmentation algorithm implemented in U-Boot, with the associated technical advisories below: This file has been truncated.U-boot is a popular boot loader for embedded systems with implementations for a large number of architectures and prominent in most Linux based embedded systems such as ChromeOS and Android Devices. -235,6 +246,7 int _maybe_unused ti_i2c_eeprom_am_get(int bus_addr, int dev_addr).+ ti_eeprom_string_cleanup(ep->version).+ strlcpy(ep->version, "EMMC", TI_EEPROM_HDR_REV_LEN + 1).+ strlcpy(ep->name, "A335BLNK", TI_EEPROM_HDR_NAME_LEN + 1).+ if (rc header = TI_EEPROM_HEADER_MAGIC.rc = ti_i2c_eeprom_get(bus_addr, dev_addr, TI_EEPROM_HEADER_MAGIC,.(it’s a simple board with DDR3+eMMC) RobertCNelson/Bootloader-Builder/blob/master/patches/v2019.04/0003-NFM-Production-eeprom-assume-device-is-BeagleBone-Bl.patch#L95-L120 Hi i personally like attacking the return of the ti_i2c_eeprom_get function, and then prep my own emulated eeprom name “A335BLNK” and basically assume the am335x-bonegreen.dtb for booting in a blank case. Please help me to point the git hub source (web link) for downloading. I am not clear they are flashed with u-boot or flashed with separate from u-boot.) (it seems to me they are all *.dtbo binary files. Does the latest source of u-boot include all the overlays, or I have to identify myself what overlays needed and download and flash myself. There are many related sites hosting u-boot source. I assume if U-Boot is checking the id, then I only need to modify the u-boot code to by-pass the id checking, which will lead to Debian (kernel) booting.Īlso, I found it is hard to locate the exact version of u-boot source code to download. My question is which module (U-BOOT, Kernel) is checking the board_id? Or both are checking the ID. And the BBBw is using this id to identify the variations of hardware and boot into right version.
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